Quarterly report pursuant to Section 13 or 15(d)

Registered Direct Equity Offerings - Additional Information (Detail)

v3.8.0.1
Registered Direct Equity Offerings - Additional Information (Detail) - USD ($)
1 Months Ended 9 Months Ended 12 Months Ended
Feb. 01, 2018
Jan. 31, 2018
Jan. 23, 2018
Nov. 30, 2017
Oct. 11, 2017
Sep. 08, 2017
Feb. 28, 2017
Jan. 31, 2017
Dec. 12, 2016
Sep. 30, 2016
Feb. 28, 2018
Feb. 28, 2017
May 31, 2017
Jun. 19, 2017
Stockholders Equity Note [Line Items]                            
Proceeds from issuance of common shares                     $ 8,990,000      
Warrants issued included in closing costs                     1,066,667      
Fair value of placement agent warrants                     $ 819,200      
Proceeds allocated to financing expense                     241,986      
Issuance cost incurred                     577,214      
Gross proceeds from issuance of common stock                     22,903,710 $ 19,133,755    
Stock repurchased during period, value                     259,157      
Short-Term Convertible Notes                            
Stockholders Equity Note [Line Items]                            
Purchase price, per share   $ 0.50                        
Warrants to purchase common shares, shares   7,718,010                       383,333
Class of warrants, exercise price   $ 0.75                        
Term of warrants   5 years                        
Number of shares to be sold   12,062,728                        
Gross proceeds from issuance of common stock   $ 6,000,000                        
Debt Instrument, maturity date   Jan. 31, 2018                     Jan. 31, 2018  
Debt Instrument, face amount   $ 6,000,000                 4,890,000   $ 1,150,000  
Debt Instrument, accrued interest   300,000                        
Long-term debt and capital lease obligations including current maturities   6,300,000                 6,038,500   $ 1,150,000  
Stock repurchased during period, value   $ 259,000                 $ 250,000      
Percentage of warrants coverage 100.00% 50.00%                        
Conversion of Stock   $ 0.75                        
Reinvestment of the principal amount per share   $ 0.50                        
Placement Agent                            
Stockholders Equity Note [Line Items]                            
Warrants to purchase common shares, shares     245,681   150,461 213,573 453,652 122,799   1,066,667 350,766 453,652    
Class of warrants, exercise price     $ 0.55   $ 0.715 $ 0.825 $ 0.825 $ 0.825   $ 0.825 $ 0.825 $ 0.825    
Term of warrants     5 years   5 years 5 years 5 years 5 years   5 years 5 years      
Percentage of shares, issued as warrants     8.00%   8.00% 8.00% 8.00% 8.00%   8.00%        
Placement Agent | Short-Term Convertible Notes                            
Stockholders Equity Note [Line Items]                            
Cash commission paid   $ 164,425                        
Securities Purchase Agreement                            
Stockholders Equity Note [Line Items]                            
Number of shares to be sold                 4,000,000 13,333,334        
Purchase price, per share                 $ 0.75 $ 0.75        
Warrants to purchase common shares, shares                 2,000,000 6,666,667 3,258,990      
Class of warrants, exercise price                 $ 1.00 $ 1.00 $ 1.00      
Term of warrants                 5 years 5 years 5 years      
Proceeds from issuance of common shares                 $ 3,000,000 $ 9,000,000        
Placement agent's fees, as a percentage of gross proceeds                   8.00%        
Subscription Agreements                            
Stockholders Equity Note [Line Items]                            
Number of shares to be sold     3,071,014   1,880,765 3,336,331 5,670,661 1,534,999            
Purchase price, per share     $ 0.50   $ 0.65 $ 0.75 $ 0.75 $ 0.75       $ 0.75    
Warrants to purchase common shares, shares   7,718,010 3,071,014   940,380 1,668,163 2,835,323 767,498       2,835,323    
Class of warrants, exercise price   $ 0.75 $ 0.75   $ 0.75 $ 1.00 $ 1.00 $ 1.00       $ 1.00    
Term of warrants   5 years 5 years   5 years 5 years 5 years 5 years            
Proceeds from issuance of common shares     $ 1,400,000   $ 1,100,000 $ 2,300,000 $ 3,800,000 $ 1,000,000            
Placement agent's fees, as a percentage of gross proceeds           9.00% 9.00% 9.00%            
Make-Whole Securities                            
Stockholders Equity Note [Line Items]                            
Number of shares to be sold       503,015                    
Warrants to purchase common shares, shares       251,504                    
Class of warrants, exercise price       $ 0.75                    
Term of warrants       5 years                    
Make-Whole Securities | Waiver and Subscription Agreement                            
Stockholders Equity Note [Line Items]                            
Purchase price, per share         $ 0.65 $ 0.75                
Class of warrants, exercise price         0.75 1.00                
Make-Whole Securities | Placement Agent                            
Stockholders Equity Note [Line Items]                            
Warrants to purchase common shares, shares       26,702             26,702      
Class of warrants, exercise price       $ 0.715   0.715                
Term of warrants       5 years                    
Make-Whole Securities | Placement Agent | Waiver and Subscription Agreement                            
Stockholders Equity Note [Line Items]                            
Class of warrants, exercise price         $ 0.715 $ 0.825